Control switch for electric sewing machines



July 4, 1933. E KHAYAT l CONTROL SWITCH FOR ELECTRIC SEWING MACHINES Filed July 29, 1951 2 Sheets-Sheet l IELCTLL INI/ENTOR. 5 /f a V4 ATTORNEYS.

July 4, 1933. E. KHAYAT 1,916,268

CONTROL SWITCH FOR ELECTRIC SEWING MACHINES Filed July 29, 1951 2 Sheets-Sheet 2 INVENTOR.

)4 ATTORNEYS.

stationary contactv andjtherefore when pressure upon thewmovable"Contact is released the movable contact will be very quickly.

moved to a closing position.

The-leverQQ by meansV of which the movable contact is to be moved to an, opened po.-V

sitionr is pivotally mounted between posts by a pivot pin or axle 3l and isstraddled by a spring 32 formed of resilient wireY and having'its arm .coiled about the pivot pin asV shown at 33 and terminatingin extensions 34. bearing against abutments 35. Therefore, the lever will be normally Vheld in position to "f retain. the movable contact out of engagement with the stationary Contact in opposition to action of the spring 28 andwhenopull upon the lever is released thespring will return the lever to the position shown in Figure 3 39'? and quickly move the movablecontact to an open position.. Therefore, arcing will not take place between the ,two contacts. An abutment pin 36 carried by the posts 30 serves to limit swinging movement of the lever in one direction and prevent it from mov-ing beyond the -position shownin Figure 3. ln order ,to reduce frictional binding between the lever and the movable contactr'there has been, provided a roller 37 and by referring to @l Figures 3 and 4L it will be seen that this roller is provided with. a core or sleeve 88 of insulating materialthrough which-extends a pivot pin or axle 39.

r' lherefore7 danger of' a short circuit will' 451 beeliminated. Arod 40 is employed to connectthe outer end ofthe lever with 4a pin All projecting .from on sideof the: treadle l2 and by an inspection of Figure l itl will be readilyyseen that when pressureis applied infor-der to-tilt the treadle forwardly pull will be exerted upon the lever andthe lever moved about its pivot 3l to force the roller toward the pin carrying end of the movable contact and away from the Contact in order that the spring 2S may act upon the movable Contact and roel; it about its pivot 27 and cause the pin 26 to move quickly into engage-- ment with the stationary contact. rFhe circuit through the motor willthen be closed- GUT and the motor set. in motion in order to operate the sewing machine. ,y 'When the sewing machine is'to be stopped it is merely necessaryto remove pressure from the treadle andthe spring 32 willreturn the lever to the position shown in Figure Sand the roller The spring serves to urge the finger towards thev the modified form shown in Figures 7 and The terminal blade l5 has its base somewhat Yshorter than thatshown in Figures il and provided with a side extension 4:23 carrying ears lll between'which a rocker :i rm l5 is pivotally mountedupon a pin 4G. 'At its front end the rocher arm has a bill -l-7 frmu which extends a pin i8 carrying a roller it!) toengage the beveled outer end of the plunger whichis slidably mounted in a housing 5l carried by'a stationary contact 52 correspending4 to the stationary contact 2l and to which the conductor wire il() is attached.

A spring 53 which is coiled about the stem 5ft of' the plunger 50 yieldably holds the plunger in an extended positionand causes it to have good contacting engagement with the roller when the rocker arm moved to a circuitclosing position by the coil spring 5.i disposed between the side ertension -l-l and the rear endy 56 of the rocker arm.

j In order to control movement of the rocher arm there has been provided a shaft 57 which extends transversely through the. switch box and carries a short lever 58 to which the upper end of therod Ll- Ofis attached. `-An abutment 59 having arms (S0 and 6l is firmly secured in a set position upon the shaft 57 by asetscrew 62 and one arm of4 this abutment extends in overlapping relation to the rear end of the rocker .arm l5 while the `second arm carries a side pin G3 engaged by one end of acoil spring 64. This spring 6i is disposed aboutthe lshaft 57 and has its other end extended as shown at 65 and engaging an abut-ment pin 66 carried by a side wall of the switch boX. llt will thus be seen` that the spring 6st will yieldably resist rotation of tl e shaft 57 in one direction and the arm (130 will apply pressure upon the rear end of the rocker arm 45 and move the rocker arm to an open position in opposition to action of the spring 55. lVhen the operator applies pressure to the treadle and exerts pull upon the rod 4.0 the shaft will be rotated and move the arm 60 away from the rocker arm. As the arm 60 moves away from the rocker arm the spring 55 will exert pressure to move the rockerV arm in a direction to cause the roller i9 to `engage thev plunger 50, Since the plunger is acted upon by the spring 53 a very good Contact will be established between the roller and the plunger and the motor circuit will be closed.

In .Figures 7 and 8 .the rocker arm 67vis backingas sho'vvn atf73 andi-its otherend en;

f this abutment is alsof -ormed `with anfarin 77 Carrying aside .-pin" 7 8 for engagement by one end ofa spring 7 9 Ivvhieh i"s`coiled about valshfa'ft 80,Corresponding-tothe Ashaft 57 The other end of the spring 79fbears against anV abutment'pinl andjthereforef'the farm 5 fWill normallyy bear? against the '-rear; end of which rises 'frfcmr the sidefextens'ionl' serves i 'beyond.thefppositionfshownin Figure 85jV 1 '*Athis*arrangementthe"spring "79 'Willfserve pressure is applied `toj the treadlejftodraw upon'thelever arm Sfand rotate the yshaft 1 y 80 pressureupontherear end of,thetrocker` :farm 67 vvill be removedand the springpermittedto quickly' move this froeker arm or' a vrrfiovfable Contact to a 'olosedposition.

to normally retain theg'switchopen but 'When vFromthe vforegoing Avdescription'jot the" con7 1 jistrufction ofmyi'mprove'd invention, the op`1 fferation lthereof and themethod of applying the saine' toy use. Willbe ,readily understood-Q'V :..It will beseen that I haveprovidedlasimple,`

e j inexpensiveaiid eicient means for Carrying elements best adapted to perform the funcgaged throughV aneyefiformed upontheu`4 -roekerarin' serves to draw the rocker, armto i b a 'closed 'positionaf` The 'reaif'end,olftlie-roelen` armf 'is `overlapped by an farm 75 offan abut-` i f `ment 76 corresponding to the abutment 59 andv Havingfthus an opening atthef side thereof, plugblades .'passingl'through said opening, said blades the terminaba spring for retainin'ggthe lever v arm :at normal position and afitreadle con heated with: the

leverv arm;V

of. tbeoontao't member towardv the terminal,

:spring supportedy and movable transversely;

:ofthe pointof Contact. f

A switeh'comprising aboX provided With passing through said opening;

lbeing of conducting, material, a contact'mem* I y A p fl-alever armmovable inengagementvvith"the- 4 Vto kengagetlie rear end of therocker arm and A. l prevent-hit from being-imovedlby the? arm 75l fleeing inyofvfll'prineiplesof theinvention.,

described the invention, what Y vjl," A switohloomprising abox'provided vi/itlr i being ofconductingmateriaL-acontact mem- 'v berpivoted to 'one blade; afterminal. located l `in tb'epathof movementofone end of the oonf tact m-embenfaspring urgingthe said end of the VContact member toivard the terminal,V av lever armemovable in engagementwithithel. eontaotniemberto space the endv thereof from Aswitchcomprlsingjaboxprovided with" ian opening atfthefside thereof, plug-blades y 1 passing through' said opening, said blades being off-.conductingmaterial," acontact mem.- Y

ber pivoted to"onexblade,1@terminal located 1 jin the path-ofmovement-:o)one end ofthe, Conta'otmemberffals 'un' r i fopen position shown inJF-igu're-8mv Aste'm'82 p g gm'g the sind end A,an opening'at thefsidefthereo,plugblades said blades i i ber pivoteol to one blade,va`ter ininal looatedin i.

pointbetween thefbifurcations; Y f

* s ELIAS ,KHAYAT- :the path of movementfofbnelgend of the `coni tact member, a' spring'urging:the said end of. i

.the )Contact member toward the terminal, a,

the terminalyafspring for retaining thel'ever -v f armat normal.position and a. treadle -conJ' i Y An eetedjvvith the lever armi, said terminal being` `L V bifuroated andadapted toreceive the Contact y110 f ygcjontat Inember'to space the endthereoffrom the terminal, a spring for' retaining'the lever'- arm atnorm'al position and a treadle connect? 'i ed v'fitlilthe'y lever.arm,z said terminal being" 

